US3952229A - Display device having signal lamps - Google Patents

Display device having signal lamps Download PDF

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Publication number
US3952229A
US3952229A US05/518,981 US51898174A US3952229A US 3952229 A US3952229 A US 3952229A US 51898174 A US51898174 A US 51898174A US 3952229 A US3952229 A US 3952229A
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US
United States
Prior art keywords
signal
lamps
lamp
diodes
testing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/518,981
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English (en)
Inventor
Heinz-Peter Rekow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3952229A publication Critical patent/US3952229A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the invention relates to a display device having signal lamps, whereby the signal lamps are connected to a signal voltage source through pilot contacts, and a test voltage source is provided to test the signal lamps.
  • the known display devices have separate test rails to test the signal lamps, all the signal lamps being connected to said rails. Said rails are periodically connected to voltage and lighting up of all the lamps is then observed by control personnel. In especially large display installations, particular difficulty is experienced by control personnel in identifying failure of a signal lamp among a multiplicity of signal lamps.
  • Such display devices are also fitted with an acoustic warning device for signalling purposes. The acoustic warning device gives off a signal for each indication, whereas the fault is specifically indicated by the signal lamp. If a defect occurs in a signal lamp in the period between two tests, only a general acoustic signal ist given in the case of a fault in the relevant circuit. In such a case, the control personnel must then press the lamp test key to determine the fault specifically. Thus unnecessary time is lost for the respective necessary switching operations necessitated by the fault signal.
  • prior art devices can have two signal lamps in parallel connection in every display field of the display device to indicate failure of an signal lamp. If one of the two signal lamps fail, the display field is illuminated in a correspondingly weaker manner and thus failure of an signal lamp ascertained.
  • Such monitoring of the signal lamps is, however, unreliable, as perception of the various degrees of illumination in the individual display fields can be rendered difficult or uncertain by various conditions.
  • Such unfavourable conditions can, for example, be varying light distribution in the room in which the display device is installed, or a large distance between the observer and the display device.
  • luminosity of the indicating lamps drop off with increasing age, and thus illumination of the respective display field weakens. Thus small differences as regards the degree of illumination of the individual display fields can result. Certain identification of signal lamp failure is made practically impossible by said differences.
  • each indicating lamp being in permanent connection with the testing voltage source via a respective series resistance decoupled from the signal voltage circuit, and the connection pole of the respective series resistance, connected with the respective indicating lamp, being connected to a testing device which emits a signal on failure of a lamp.
  • connection poles of a number of series resistances can be switched groupwise onto the testing device, and be decoupled from each other.
  • the indicating lamps in a display device e.g. a mosaic system diagram, in which a number of indicating lamps are always in operation may only be switched off, for a short period during testing procedures, so that transmission of information through the indicating lamps is not disturbed.
  • a display device e.g. a mosaic system diagram, in which a number of indicating lamps are always in operation may only be switched off, for a short period during testing procedures, so that transmission of information through the indicating lamps is not disturbed.
  • 1 and 2 represent two signal lamps which are connected with their one connection pole to the common minus pole 3 of a signal and testing voltage source.
  • 4 represents the plus pole of the signal voltage source and 5 the plus pole of the testing voltage source.
  • the signal lamp 1 and 2 are connected with their other connection pole via a first decoupling diode 6 or 7 and a pilot contact 8 or 9 to the plus pole 4 of the signal voltage source.
  • this other connection pole of the signal lamps 1 and 2 is connected via a second decoupling diode 10 or 11 and a series resistance 12 or 13 to the plus pole 5 of the testing voltage source.
  • a third decoupling diode 14 or 15 is interposed between the second decoupling diode 10 or 11 and the series resistance 12 or 13.
  • These third decoupling diodes 14 and 15 are mutually connected to a testing device 16. As represented by dashed, line 17, an effective connection exists between the testing device 16 and the signal contacts 8 and 9.
  • the indicating device works as follows: the signal lamps 1 and 2 can, as per FIGURE, be in fixed connection with the plus pole 5 of the testing voltage source. In this case the voltage of the testing voltage source is selected lower than the voltage of the signal voltage source.
  • a current flows via the series resistances 12 and 13 and the second decoupling diodes 10 and 11 into the signal lamps 1 and 2, said current pre-warming the signal lamps.
  • the potential at the common junction point of the series resistances 12 and 13 and of the second decoupling diodes 10 and 11 is tapped via the third decoupling diodes 14 and 15 and supplied to the testing device 16. As long as the signal lamps 1 and 2 are intact, the potential tapped at the common junction point of the series resistance and the respective second decoupling diode is lower than the potential of the plus pole 5 of the testing voltage source.
  • the potential at the common junction point of the series resistance 12 and the second decoupling diode 11 is equal to the potential of the plus pole 5 of the test voltage source. This higher potential reaches the testing device 16 via the third decoupling diode 14 or 15, thus actuating a signal.
  • testing device 16 If an effective connection exists between the testing device 16 and the pilot contact 8 and 9, these are automatically opened when a test command is given to the testing device 16.
  • a particular advantage is gained by utilising a computer as a testing device 16, as a computer facilitates very low test times, and thus the transmission of information through the display device is not interrupted as a result of the short-term switching of all signal lamps.
  • the signal lamps of the display device described can be individually examined on principle. This, however, involves high expenditure. This expenditure can be reduced by arranging a given number of signal lamps into groups. The test circuits must be decoupled from each other when a number of signal lamps are in such a combined group. The FIGURE represents this for two signal lamps.

Landscapes

  • Audible And Visible Signals (AREA)
  • Tests Of Electronic Circuits (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
US05/518,981 1973-10-31 1974-10-29 Display device having signal lamps Expired - Lifetime US3952229A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2354582A DE2354582C2 (de) 1973-10-31 1973-10-31 Anzeigevorrichtung mit Meldelampen
DT2354582 1973-10-31

Publications (1)

Publication Number Publication Date
US3952229A true US3952229A (en) 1976-04-20

Family

ID=5896947

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/518,981 Expired - Lifetime US3952229A (en) 1973-10-31 1974-10-29 Display device having signal lamps

Country Status (3)

Country Link
US (1) US3952229A (enrdf_load_stackoverflow)
JP (1) JPS5075798A (enrdf_load_stackoverflow)
DE (1) DE2354582C2 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4041451A (en) * 1975-05-02 1977-08-09 Konstantin Zarkadas Circuit for monitoring the operativeness of current-consuming electrical devices
US4045681A (en) * 1974-11-29 1977-08-30 Mcdonnell Douglas Corporation Cargo transfer logic circuitry
US4222047A (en) * 1978-11-06 1980-09-09 Finnegan George E Lamp failure detection apparatus
US4745339A (en) * 1985-04-12 1988-05-17 Kabushiki Kaisha Tokai Rika Denki Seisakusho Lamp failure detecting device for automobile
US5148158A (en) * 1988-03-24 1992-09-15 Teledyne Industries, Inc. Emergency lighting unit having remote test capability

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176240A (en) * 1981-04-18 1982-10-29 Toyoda Automatic Loom Works Detection of display lamp damage in fiber machine
JPS5814491A (ja) * 1981-07-17 1983-01-27 三菱重工業株式会社 ランプ制御回路
JPS58225360A (ja) * 1982-06-24 1983-12-27 Fujitsu Ten Ltd ランプ断線検知装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631393A (en) * 1968-07-01 1971-12-28 Lucas Industries Ltd Vehicle lamp failure warning system having warning circuit completed when lamp is off
US3643247A (en) * 1969-12-22 1972-02-15 Lockheed Aircraft Corp Apparatus for detecting open-circuit condition
US3706983A (en) * 1971-01-18 1972-12-19 Buckbee Mears Co Lamp circuit
US3719937A (en) * 1971-02-11 1973-03-06 Master Specialties Co Failure detection circuit
US3745547A (en) * 1972-06-22 1973-07-10 Standard Electric Time Corp Lamp supervisory circuit
US3825914A (en) * 1972-12-22 1974-07-23 Electrospace Corp Lamp failure detector assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631393A (en) * 1968-07-01 1971-12-28 Lucas Industries Ltd Vehicle lamp failure warning system having warning circuit completed when lamp is off
US3643247A (en) * 1969-12-22 1972-02-15 Lockheed Aircraft Corp Apparatus for detecting open-circuit condition
US3706983A (en) * 1971-01-18 1972-12-19 Buckbee Mears Co Lamp circuit
US3719937A (en) * 1971-02-11 1973-03-06 Master Specialties Co Failure detection circuit
US3745547A (en) * 1972-06-22 1973-07-10 Standard Electric Time Corp Lamp supervisory circuit
US3825914A (en) * 1972-12-22 1974-07-23 Electrospace Corp Lamp failure detector assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045681A (en) * 1974-11-29 1977-08-30 Mcdonnell Douglas Corporation Cargo transfer logic circuitry
US4041451A (en) * 1975-05-02 1977-08-09 Konstantin Zarkadas Circuit for monitoring the operativeness of current-consuming electrical devices
US4222047A (en) * 1978-11-06 1980-09-09 Finnegan George E Lamp failure detection apparatus
US4745339A (en) * 1985-04-12 1988-05-17 Kabushiki Kaisha Tokai Rika Denki Seisakusho Lamp failure detecting device for automobile
US5148158A (en) * 1988-03-24 1992-09-15 Teledyne Industries, Inc. Emergency lighting unit having remote test capability

Also Published As

Publication number Publication date
DE2354582C2 (de) 1975-09-04
JPS5075798A (enrdf_load_stackoverflow) 1975-06-21
DE2354582B1 (de) 1975-01-23

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